Coffee machine



FIG. 1 is a front right side perspective view showing the new design for a coffee machine;

FIG. 2 is a front left side perspective view thereof;

FIG. 3 is a rear right side perspective view thereof;

FIG. 4 is a rear left side perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a left side view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof.

The broken lines in the drawing depict portions of the coffee machine that form no part of the claimed design. 

CLAIM The ornamental design for a coffee machine, as shown and described. 